* {
    margin: 0;
    padding: 0;
}

a {
    font-style: normal;
    text-decoration: none;
    color: #000;
}

ul li {
    list-style-type: none;
}

main {
    width: 100%;
}

.section1 {
    width: 100%;
}

nav {
    width: 1200px;
    height: 18px;
    padding: 20PX 0;
    margin: 0 auto;
}

nav ul {
    overflow: hidden;
}

nav ul li {
    height: 18px;
    line-height: 18px;
    font-size: 14px;
    float: left;
    margin-right: 8px;
    color: #3b3e40;
}

/* section2 */
.section2 {
    width: 1200px;
    height: 509px;
    margin: auto;
    position: relative;
}

.section2_left {
    width: 656px;
    height: 509px;
}

.section2_left .section2_left_buttom {
    margin: auto;
    width: 445px;
    height: 445px;
    background-image: url(../images/Bsection2_left.jpg);
    background-size: cover;
    position: relative;
    margin-bottom: 24px;
}

.section2_left_buttom .leftarrows {
    position: absolute;
    left: 0;
    line-height: 48px;
    text-align: center;
    top: 198px;
    width: 48px;
    height: 48px;
    font-size: 24px;
    color: white;
    border-radius: 24px;
    background-color: rgba(0, 0, 0, 0.2);
}

.section2_left_buttom .rightarrows {
    position: absolute;
    right: 0;
    line-height: 48px;
    text-align: center;
    top: 198px;
    width: 48px;
    height: 48px;
    font-size: 24px;
    color: white;
    border-radius: 24px;
    background-color: rgba(0, 0, 0, 0.2);
}

.section2_left_bottom {
    width: 656px;
    height: 32px;
    line-height: 32px;
    text-align: center;
}

.section2_left_bottom span {
    font-size: 14px;
    height: 32px;
    display: inline-block;
    line-height: 32px;

}

.section2_left_bottom span:nth-child(1) {
    width: 84px;
    background-color: #000;
    color: white;
    border-radius: 16px;

}

.section2_left_bottom span:nth-child(2) {
    margin: 0 16px;
    width: 84px;
    border-radius: 16px;
    color: rgba(0, 0, 0, 0.65);
    border-radius: 16px;
}

.section2_left_bottom span:nth-child(3) {
    width: 84px;
    border-radius: 16px;
    color: rgba(0, 0, 0, 0.65);
    border-radius: 16px;
}

.section2_left_bottom span:nth-child(2):hover {
    background-color: rgba(0, 0, 0, 0.2);
}

.section2_left_bottom span:nth-child(3):hover {
    background-color: rgba(0, 0, 0, 0.2);
}

.section2_right {
    width: 500px;
    height: 509px;
    position: absolute;
    top: 0;
    right: 0;
}

.section2_right h2 {
    height: 32px;
    line-height: 32px;
    font-size: 30px;
    color: #333;
}

.section2_right h4 {
    height: 28px;
    line-height: 28px;
    font-size: 26px;
    color: #333;
    padding-top: 16px;
}

.section2_right h5 {
    height: 20px;
    line-height: 20px;
    font-size: 14px;
    color: #3b3e40;
    ;
    padding-top: 4px;
}

.section2_right h5 span {
    font-weight: 400;
}

.section2_right ul {
    height: 188px;
    margin-top: 16px;
    margin-left: 18px;
}

.section2_right ul li {
    font-size: 14px;
    height: 20px;
    margin-top: 4px;
    color: rgba(0, 0, 0, .65);
    line-height: 20px;
    text-align: left;
    list-style-type: disc;
}

.section2 .section2_right div {
    height: 24px;
    margin-top: 8px;
}

.section2 .section2_right div a {
    font-size: 14px;
    color: #007aff;
}

.section2 .section2_right div:hover a {
    text-decoration: underline;
}

.section2 .section2_right .warm_prompt {
    width: 452px;
    height: 52px;
    padding: 24px 24px;
    margin-top: 24px;
    background-color: rgba(0, 0, 0, 0.02);
}

.section2 .section2_right .warm_prompt div {
    width: 48px;
    height: 14px;
    font-size: 8px;
    color: #fa8c16;
    border: 1px solid #fa8c16;
    border-radius: 4px;
    padding: 0 3px;
}

.section2 .section2_right .warm_prompt p {
    height: 20px;
    line-height: 20px;
    margin-top: 8px;
    font-size: 14px;
    color: rgba(0, 0, 0, 0.85);
}

.section3 {
    width: 1200px;
    height: 128px;
    margin: auto;
    position: relative;
}

.section3_empty {
    width: 1425px;
    height: 128px;
    position: absolute;
    top: 0;
    left: -113px;
}

.section3_empty div {
    width: 1425px;
    height: 64px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.02);
}

.section4 {
    width: 1216px;
    height: 2000px;
    margin-bottom: 96px;
    margin: auto;
}

.section4 .section4_part1 {
    width: 1200px;
    height: 520px;
    padding: 0 8px;
}

.section4 .section4_part1 h2 {
    margin-bottom: 16px;
    height: 40px;
    line-height: 40px;
    font-size: 38px;
    text-align: center;
}

.section4 .section4_part1 .part1_video {
    width: 1200px;
    height: 400px;
    position: relative;
}

.section4 .section4_part1 .part1_video div {
    width: 950px;
    height: 64px;
    padding: 32px 32px 64px;
    position: absolute;
    top: 0;
    left: 100px;

}

.section4 .section4_part1 .part1_video div h2 {
    height: 32px;
    line-height: 32px;
    font-size: 28px;
    margin-bottom: 8px;
    color: white;
    text-align: left;
}

.section4 .section4_part1 .part1_video div p {
    line-height: 24px;
    color: white;
    height: 24px;
    font-size: 16px;
}

.section4 .section4_part2 {
    width: 1216px;
    height: 480px;
    position: relative;
}

.section4 .section4_part2 .part2_left {
    margin-top: 16px;
    width: 506.5px;
    height: 480px;
    /* padding: 0 8px; */
    background-image: url(../images/part2_left.jpg);
    background-size: cover;
}

.section4 .section4_part2 .part2_left h2 {
    height: 32px;
    line-height: 32px;
    font-size: 28px;
    padding-top: 32px;
    margin-left: 32px;
    margin-bottom: 8px;
    color: white;
}

.section4 .section4_part2 .part2_left p {
    margin-left: 32px;
    margin-right: 32px;
    line-height: 24px;
    color: white;
    height: 24px;
    font-size: 16px;
}

.section4 .section4_part2 .part2_right {
    width: 693.5px;
    height: 480px;
    /* padding: 0 8px; */
    background-image: url(../images/part2_right.jpg);
    background-size: cover;
    position: absolute;
    top: 0;
    right: 0;
}

.section4 .section4_part2 .part2_right h2 {
    height: 32px;
    line-height: 32px;
    font-size: 28px;
    padding-top: 32px;
    margin-left: 32px;
    margin-bottom: 8px;
    color: white;
}

.section4 .section4_part2 .part2_right p {
    margin-left: 32px;
    margin-right: 32px;
    line-height: 24px;
    color: white;
    height: 24px;
    font-size: 16px;
}

/* part3 */

.section4 .section4_part3 {
    width: 1216px;
    height: 480px;
    position: relative;
}

.section4 .section4_part3 .part3_left {
    width: 693.5px;
    height: 480px;
    margin-top: 16px;
    /* padding: 0 8px; */
    background-image: url(../images/part3_left.jpg);
    background-size: cover;
}

.section4 .section4_part3 .part3_left h2 {
    height: 32px;
    line-height: 32px;
    font-size: 28px;
    padding-top: 32px;
    margin-left: 32px;
    margin-bottom: 8px;
    color: white;
}

.section4 .section4_part3 .part3_left p {
    margin-left: 32px;
    margin-right: 32px;
    line-height: 24px;
    color: white;
    height: 24px;
    font-size: 16px;
}

.section4 .section4_part3 .part3_right {
    /* margin-top: 16px; */
    width: 506.5px;
    height: 480px;
    /* padding: 0 8px; */
    position: absolute;
    top: 0;
    right: 0;
    background-image: url(../images/part3_right.jpg);
    background-size: cover;
}

.section4 .section4_part3 .part3_right h2 {
    height: 32px;
    line-height: 32px;
    font-size: 28px;
    padding-top: 32px;
    margin-left: 32px;
    margin-bottom: 8px;
    color: white;
}

.section4 .section4_part3 .part3_right p {
    margin-left: 32px;
    margin-right: 32px;
    line-height: 24px;
    color: white;
    height: 24px;
    font-size: 16px;
}

.section4 .section4_part4 {
    width: 1216px;
    height: 400px;
    margin-top: 16px;
    background-image: url(../images/part4.jpg);
    background-size: cover;
}

.section4 .section4_part4 h2 {
    padding: 32px 32px 0;
    margin-bottom: 8px;
    height: 32px;
    line-height: 32px;
    font-size: 28px;
    color: white;
}

.section4 .section4_part4 p:nth-child(2) {
    padding: 0 32px 64px;
    color: white;
    height: 24px;
    font-size: 16px;
}

.section4 .section4_part4 p:nth-child(3) {
    margin-top: 270px;
    text-align: center;
}
.section4 .section4_part4 p:nth-child(3) a {
    color: #007aff;
}
.section4 .section4_part4 p:nth-child(3) a:hover {
    text-decoration: underline;
}
.section5 {
    width: 1200px;
    height: 625.5px;
    margin: 96px auto;
}
.section5 h2 {
    font-size: 32px;
    font-weight: 600;
    line-height: 40px;
    text-align: center;
    color: #3b3e40;
}
.section5>div {
    width: 1200px;
    height: 569.5px;
    margin-top: 16px;
}
.section5>div ul {
    width: 1216px;
    height: 382.5px;
    margin: 16px 0 0;
    padding-right: 8px;
    padding-left: 8px;
    color: #3b3e40;
    /* overflow: hidden; */
}

.section5>div ul li {
    width: 186.5px;
    height: 258.5px;
    float: left;
    margin: 16px 0 0;
    padding-right: 8px;
    padding-left: 8px;
}
.section5>div ul li div:nth-child(1) {
    width: 186.5px;
    height: 186.5px;
    background-color: #F7F9FA;
}
.section5>div ul li div:nth-child(2) {
    width: 186.5px;
    height: 44px;
}
.section5>div ul li div:nth-child(2) p:nth-child(1) {
    font-size: 16px;
    line-height: 20px;
    font-weight: 600;
    margin-top: 8px;
    margin-right: 16px;
}


